Murphy, J. (1991). Farmers' estimations as a source of production data: Methodological guidelines for cereals in Africa. World Bank.
Cita Chicago (17th ed.)Murphy, Josette. Farmers' Estimations as a Source of Production Data: Methodological Guidelines for Cereals in Africa. Washington: World Bank, 1991.
Cita MLA (9th ed.)Murphy, Josette. Farmers' Estimations as a Source of Production Data: Methodological Guidelines for Cereals in Africa. World Bank, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.